I can only imagine!
Do you sort the bits out by what they are (locomotive bits, building bits, wagon bits, etc) or by the materials (brass, plastic, card, etc)?
After going through a couple of San Francisco Cable Car kits for parts to make my Sydney D class tram, as well as the conversion of the Minicraft Models Vulcan 2-4-0 to standard gauge, there is a huge amount of plastic components left over. I think perhaps I should build up some of the coaches for On30 and flog them off on ebay.